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usb: bdc: Add support for suspend/resume 

Based on a previous commit by Danesh Petigara <dpetigara@broadcom.com>
that added resume to solve the following problem:
"The BDC driver will fail after resuming from S3 suspend and this
will cause any upper layer gadget driver to fail."
This commit also adds support for suspend and manages the clock during
suspend/resume.

Signed-off-by: Al Cooper <alcooperx@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Al Cooper 2017-07-19 15:11:45 -04:00 committed by Felipe Balbi
parent 8ac1685bf9
commit 0de9742514
2 changed files with 37 additions and 0 deletions
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1
drivers/usb/gadget/udc/bdc/bdc.h
View File

@ -454,6 +454,7 @@ struct bdc {
* Func Wake packet every 2.5 secs. Refer to USB3 spec section 8.5.6.4
*/
struct delayed_work func_wake_notify;
struct clk *clk;
};
static inline u32 bdc_readl(void __iomem *base, u32 offset)

36
drivers/usb/gadget/udc/bdc/bdc_core.c
View File

@ -473,6 +473,8 @@ static int bdc_probe(struct platform_device *pdev)
if (!bdc)
return -ENOMEM;
bdc->clk = clk;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
bdc->regs = devm_ioremap_resource(dev, res);
if (IS_ERR(bdc->regs)) {
@ -529,10 +531,43 @@ static int bdc_remove(struct platform_device *pdev)
dev_dbg(bdc->dev, "%s ()\n", __func__);
bdc_udc_exit(bdc);
bdc_hw_exit(bdc);
clk_disable_unprepare(bdc->clk);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int bdc_suspend(struct device *dev)
{
struct bdc *bdc = dev_get_drvdata(dev);
clk_disable_unprepare(bdc->clk);
return 0;
}
static int bdc_resume(struct device *dev)
{
struct bdc *bdc = dev_get_drvdata(dev);
int ret;
ret = clk_prepare_enable(bdc->clk);
if (ret) {
dev_err(bdc->dev, "err enabling the clock\n");
return ret;
}
ret = bdc_reinit(bdc);
if (ret) {
dev_err(bdc->dev, "err in bdc reinit\n");
return ret;
}
return 0;
}
#endif /* CONFIG_PM_SLEEP */
static SIMPLE_DEV_PM_OPS(bdc_pm_ops, bdc_suspend,
bdc_resume);
static const struct of_device_id bdc_of_match[] = {
{ .compatible = "brcm,bdc-v0.16" },
{ .compatible = "brcm,bdc" },
@ -543,6 +578,7 @@ static struct platform_driver bdc_driver = {
.driver = {
.name = BRCM_BDC_NAME,
.owner = THIS_MODULE,
.pm = &bdc_pm_ops,
.of_match_table = bdc_of_match,
},
.probe = bdc_probe,